(PECL spplus >= 1.0.0)
calcul_hmac — Obtain a hmac key (needs 8 arguments)
This function is currently not documented; only its argument list is available.
Returns TRUE on success or FALSE on failure.
This function is EXPERIMENTAL. The behaviour of this function, its name, and surrounding documentation may change without notice in a future release of PHP. This function should be used at your own risk.